On Thu, Oct 01, 2015 at 07:22:20PM +0200, Nils Reu??e wrote:
> Hi tech,
>
> i was a bit confused when i tried to mount my ext4-drive; it was not obvious
> to me that i had to pass the -r/-o ro option to mount the disk. The FAQ is
> also not very explicit about that:
>
> "Some of them have limited support; for instance read-only. "
>
> http://www.openbsd.org/faq/faq14.html#foreignfs
>
> So i tried the man pages, but they don't mention that ext4 is mountable at
> all. A
>
> # mount -t ext2fs /dev/sdb6i /mnt
>
> did not return any error and just did nothing. Maybe this is obvious that
> you have to pass the ro-flag, but i thought it would "just work". That was
> wrong, obviously, but here is my proposal to add a little information to the
> manpages.
>
> Any comments?
>
thanks for tonight's worm can.
actually our docs do a bad job of explaining ext3 and 4 support, but i
know very little about them. i don;t think your diff is the way to go
though. some points:
- we have enough examples in mount(8), i think
- look at mount_ntfs(8): it does a nice job of explaining it's
ro instead of just giving an example. i think that's a better
way. having said that:
- there are also tools like newfs_ext2fs(8), so we need to look
at this as a whole. this doc does actually mention ext4.
so i'd look at a diff which nicely explains to what extent ext3 and 4
are supported across our ext tool pages. but i don;t feel in a position
to write that diff myself.
jmc
>
> Index: mount.8
> ===
> RCS file: /cvs/src/sbin/mount/mount.8,v
> retrieving revision 1.77
> diff -u -p -r1.77 mount.8
> --- mount.8 8 Sep 2014 04:40:30 - 1.77
> +++ mount.8 1 Oct 2015 17:06:08 -
> @@ -381,6 +381,12 @@ with option
> .Dq dev :
> .Pp
> .Dl # mount -u -o dev /var
> +.Pp
> +Mount an ext4 device with DUID 3eb7f9da875cb9ee on node
> +.Pa /mnt/ext4 :
> +.Pp
> +.Dl # mount -t ext2fs -r 3eb7f9da875cb9ee.i /mnt/ext4
> +.Pp
> .Sh SEE ALSO
> .Xr mount 2 ,
> .Xr fstab 5 ,
> Index: mount_ext2fs.8
> ===
> RCS file: /cvs/src/sbin/mount_ext2fs/mount_ext2fs.8,v
> retrieving revision 1.14
> diff -u -p -r1.14 mount_ext2fs.8
> --- mount_ext2fs.814 Oct 2010 07:05:43 - 1.14
> +++ mount_ext2fs.81 Oct 2015 17:02:27 -
> @@ -33,7 +33,7 @@
> .Os
> .Sh NAME
> .Nm mount_ext2fs
> -.Nd mount an ext2fs file system
> +.Nd mount an ext2/3/4 file system
> .Sh SYNOPSIS
> .Nm mount_ext2fs
> .Op Fl o Ar options
> @@ -42,10 +42,12 @@
> .Sh DESCRIPTION
> The
> .Nm
> -command attaches an ext2fs file system
> +command attaches an ext2/3/4 file system
> .Ar special
> device on to the file system tree at the point
> .Ar node .
> +Filesystems of type ext3/4 are only supported in read-only
> +mode.
> This command is invoked by
> .Xr mount 8
> when using the syntax
>
