linux-kernel - Re: [PATCH] driver core: add uid and gid to devtmpfs

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Date:	Wed, 10 Apr 2013 08:56:28 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	linux-kernel@...r.kernel.org, Kay Sievers <kay@...y.org>
Subject: Re: [PATCH] driver core: add uid and gid to devtmpfs

On Wed, Apr 10, 2013 at 05:12:17PM +0800, Ming Lei wrote:
> On Sun, Apr 7, 2013 at 12:56 AM, Greg KH <gregkh@...uxfoundation.org> wrote:
> > @@ -201,14 +206,14 @@ static int handle_create(const char *nod
> >         if (IS_ERR(dentry))
> >                 return PTR_ERR(dentry);
> >
> > -       err = vfs_mknod(path.dentry->d_inode,
> > -                       dentry, mode, dev->devt);
> > +       err = vfs_mknod(path.dentry->d_inode, dentry, mode, dev->devt);
> >         if (!err) {
> >                 struct iattr newattrs;
> >
> > -               /* fixup possibly umasked mode */
> >                 newattrs.ia_mode = mode;
> > -               newattrs.ia_valid = ATTR_MODE;
> > +               newattrs.ia_uid = uid;
> > +               newattrs.ia_gid = gid;
> 
> drivers/base/devtmpfs.c: In function 'handle_create':
> drivers/base/devtmpfs.c:214:19: error: incompatible types when
> assigning to type 'kuid_t' from type 'uid_t'
> drivers/base/devtmpfs.c:215:19: error: incompatible types when
> assigning to type 'kgid_t' from type 'gid_t'
> make[2]: *** [drivers/base/devtmpfs.o] Error 1

I can't duplicate this here, what options am I missing?

> Looks the below patch may fix it.
> --
> diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
> index fda5256..e268fc5 100644
> --- a/drivers/base/devtmpfs.c
> +++ b/drivers/base/devtmpfs.c
> @@ -211,8 +211,8 @@ static int handle_create(const char *nodename,
> umode_t mode, uid_t uid,
>  		struct iattr newattrs;
> 
>  		newattrs.ia_mode = mode;
> -		newattrs.ia_uid = uid;
> -		newattrs.ia_gid = gid;
> +		newattrs.ia_uid = KUIDT_INIT(uid);
> +		newattrs.ia_gid = KGIDT_INIT(gid);
>  		newattrs.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID;
>  		mutex_lock(&dentry->d_inode->i_mutex);
>  		notify_change(dentry, &newattrs);
> 

Care to resend this in a format I can apply it in?  :)

thanks,

greg k-h
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