On Tuesday 23 January 2007 14:17, Johannes Stezenbach wrote:
> On Tue, Jan 23, 2007 at 09:02:30AM +0100, Blaisorblade wrote:
> > On Monday 22 January 2007 21:13, Johannes Stezenbach wrote:
> > > I was playing with user-mode Linux and found that mknod creates
> > > devices node in hostfs with wrong major/minor numbers.
> > > The patch below fixes it for me.
> >
> > Hmpf. Still having this bug on hostfs is quite bad. Thanks for reporting.
I've now seen - we never fixed this one, we fixed the analogous problem
on 'ls' output and friends (in init_inode, which is used in many places).
> > It should be hostfs_user.c to take major and minor and to combine them
> > correctly - it can use libc's macros.
>
> Right, below is a better patch.
Exactly what I meant, thanks!
I'd say:
Acked-by: Paolo 'Blaisorblade' Giarrusso <[email protected]>
This can go to 2.6.20, and possibly even to -stable (after either me or Jeff
tests it once).
> ---
> Fix UML hostfs mknod(): userspace has differernt
> dev_t size and encoding than kernel, so extract major/minor
> and reencode using glibc makedev() macro.
>
> Signed-off-by: Johannes Stezenbach <[email protected]>
>
> diff -rup linux-2.6.19.orig/fs/hostfs/hostfs.h
> linux-2.6.19/fs/hostfs/hostfs.h ---
> linux-2.6.19.orig/fs/hostfs/hostfs.h 2006-11-29 22:57:37.000000000 +0100
> +++ linux-2.6.19/fs/hostfs/hostfs.h 2007-01-23 14:11:03.000000000 +0100 @@
> -76,7 +76,7 @@ extern int make_symlink(const char *from
> extern int unlink_file(const char *file);
> extern int do_mkdir(const char *file, int mode);
> extern int do_rmdir(const char *file);
> -extern int do_mknod(const char *file, int mode, int dev);
> +extern int do_mknod(const char *file, int mode, unsigned int major,
> unsigned int minor);
> extern int link_file(const char *from, const char
> *to);
> extern int do_readlink(char *file, char *buf, int size);
> extern int rename_file(char *from, char *to);
> diff -rup linux-2.6.19.orig/fs/hostfs/hostfs_kern.c
> linux-2.6.19/fs/hostfs/hostfs_kern.c ---
> linux-2.6.19.orig/fs/hostfs/hostfs_kern.c 2006-11-29 22:57:37.000000000
> +0100 +++ linux-2.6.19/fs/hostfs/hostfs_kern.c 2007-01-23
> 14:11:20.000000000 +0100 @@ -755,7 +755,7 @@ int hostfs_mknod(struct inode
> *dir, stru
> goto out_put;
>
> init_special_inode(inode, mode, dev);
> - err = do_mknod(name, mode, dev);
> + err = do_mknod(name, mode, MAJOR(dev), MINOR(dev));
> if(err)
> goto out_free;
>
> diff -rup linux-2.6.19.orig/fs/hostfs/hostfs_user.c
> linux-2.6.19/fs/hostfs/hostfs_user.c ---
> linux-2.6.19.orig/fs/hostfs/hostfs_user.c 2006-11-29 22:57:37.000000000
> +0100 +++ linux-2.6.19/fs/hostfs/hostfs_user.c 2007-01-23
> 14:11:39.000000000 +0100 @@ -295,11 +295,11 @@ int do_rmdir(const char
> *file)
> return(0);
> }
>
> -int do_mknod(const char *file, int mode, int dev)
> +int do_mknod(const char *file, int mode, unsigned int major, unsigned int
> minor) {
> int err;
>
> - err = mknod(file, mode, dev);
> + err = mknod(file, mode, makedev(major, minor));
> if(err) return(-errno);
> return(0);
> }
--
Inform me of my mistakes, so I can add them to my list!
Paolo Giarrusso, aka Blaisorblade
http://www.user-mode-linux.org/~blaisorblade
Chiacchiera con i tuoi amici in tempo reale!
http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com
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