Messages in this thread |  | | | Date | Sun, 6 Jan 2008 08:45:58 +0100 | | From | Willy Tarreau <> | | Subject | Re: [PATCH][RFC] Simple tamper-proof device filesystem. |
On Sun, Jan 06, 2008 at 04:36:06PM +0900, Tetsuo Handa wrote:
> Hello.
>
> Willy Tarreau wrote:
> > Your patch is very confusing. In your description, as well as in the
> > comments you talk about tmpfs, but your patch does not touch even one
> > line of tmpfs and only changes ramfs. Even your variables and arguments
> > refer to tmpfs. The Kconfig entry indicates that the feature depends
> > on TMPFS too.
> >
> > Judging from the following comment :
> > * Original tmpfs doesn't set ramfs_dir_inode_operations.setattr field.
> >
> > I suspect that you confuse both filesystems.
> > - ramfs is in fs/ramfs and is always compiled in, you cannot disable it
> > - tmpfs is in mm/shmem.c and is optional. It also supports options that
> > ramfs does not (eg: size) and data may be swapped.
> >
> > Please understand that I'm not discussing the usefulness of your patch,
> > I'm just trying to avoid a huge confusion.
>
> Oh, I thought the filesystem mounted by "mount -t tmpfs none /tmp" is "tmpfs"
Yes, that is a tmpfs.
> and the source code of "tmpfs" is located in fs/ramfs directory.
No, ramfs is what you get by "mount -t ramfs none /tmp" :-)
You will notice that "df" will not report your ramfs by default because it
reports zero blocks. But "mount" or "df /tmp" will report it.
> So, I should write the description as "an extension to ramfs" rather than
> "an extension to tmpfs".
and please also the comments, macros and variable names in the code, as they
are what confused me first.
> I'll fix it in next posting.
Thanks,
Willy
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