linux-kernel - Re: [RFC PATCH 1/2] autofs: set compat flag on sbi when daemon uses 32bit addressation

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Message-ID: <e86c66c6-7430-00e2-518a-cb2b87ab4130@themaw.net>
Date:   Thu, 14 Sep 2017 08:38:02 +0800
From:   Ian Kent <raven@...maw.net>
To:     Stanislav Kinsburskiy <skinsbursky@...tuozzo.com>
Cc:     autofs@...r.kernel.org, linux-kernel@...r.kernel.org,
        devel@...nvz.org, ldv@...linux.org
Subject: Re: [RFC PATCH 1/2] autofs: set compat flag on sbi when daemon uses
 32bit addressation

On 01/09/17 19:21, Stanislav Kinsburskiy wrote:
> Signed-off-by: Stanislav Kinsburskiy <skinsbursky@...tuozzo.com>
> ---
>  fs/autofs4/autofs_i.h  |    3 +++
>  fs/autofs4/dev-ioctl.c |    3 +++
>  fs/autofs4/inode.c     |    4 +++-
>  3 files changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
> index 4737615..3da105f 100644
> --- a/fs/autofs4/autofs_i.h
> +++ b/fs/autofs4/autofs_i.h
> @@ -120,6 +120,9 @@ struct autofs_sb_info {
>  	struct list_head active_list;
>  	struct list_head expiring_list;
>  	struct rcu_head rcu;
> +#ifdef CONFIG_COMPAT
> +	unsigned is32bit:1;
> +#endif
>  };
>  
>  static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb)
> diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
> index b7c816f..467d6c4 100644
> --- a/fs/autofs4/dev-ioctl.c
> +++ b/fs/autofs4/dev-ioctl.c
> @@ -397,6 +397,9 @@ static int autofs_dev_ioctl_setpipefd(struct file *fp,
>  		sbi->pipefd = pipefd;
>  		sbi->pipe = pipe;
>  		sbi->catatonic = 0;
> +#ifdef CONFIG_COMPAT
> +		sbi->is32bit = is_compat_task();
> +#endif
>  	}
>  out:
>  	put_pid(new_pid);
> diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
> index 09e7d68..21d3c0b 100644
> --- a/fs/autofs4/inode.c
> +++ b/fs/autofs4/inode.c
> @@ -301,7 +301,9 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
>  	} else {
>  		sbi->oz_pgrp = get_task_pid(current, PIDTYPE_PGID);
>  	}
> -
> +#ifdef CONFIG_COMPAT
> +	sbi->is32bit = is_compat_task();
> +#endif
>  	if (autofs_type_trigger(sbi->type))
>  		__managed_dentry_set_managed(root);
>  
> 

Not sure about this.

Don't you think it would be better to avoid the in code #ifdefs by doing some
checks and defines in the header file and defining what's need to just use
is_compat_task().

Not sure 2 patches are needed for this either ......

Ian