linux-kernel - Re: [PATCH] f2fs: add compat_ioctl to provide backward compatability

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Date:	Tue, 5 Feb 2013 14:28:32 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	jaegeuk.kim@...sung.com
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net,
	Namjae Jeon <linkinjeon@...il.com>,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Amit Sahrawat <a.sahrawat@...sung.com>
Subject: Re: [PATCH] f2fs: add compat_ioctl to provide backward compatability

Hi Jaegeuk.

Oops!, I was missing include header.
Sorry, I will send v2 patch again.

Thanks.

2013/2/4, Namjae Jeon <linkinjeon@...il.com>:
> From: Namjae Jeon <namjae.jeon@...sung.com>
>
> adding compat_ioctl to provide support for backward comptability - 32bit
> binary
> execution on 64bit kernel.
>
> Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
> Signed-off-by: Amit Sahrawat <a.sahrawat@...sung.com>
> ---
>  fs/f2fs/f2fs.h |   15 +++++++++++++++
>  fs/f2fs/file.c |   20 ++++++++++++++++++++
>  2 files changed, 35 insertions(+)
>
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 58dd608..7bf86c8 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -104,6 +104,20 @@ static inline int update_sits_in_cursum(struct
> f2fs_summary_block *rs, int i)
>  }
>
>  /*
> + * ioctl commands
> + */
> +#define F2FS_IOC_GETFLAGS               FS_IOC_GETFLAGS
> +#define F2FS_IOC_SETFLAGS               FS_IOC_SETFLAGS
> +
> +#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
> +/*
> + * ioctl commands in 32 bit emulation
> + */
> +#define F2FS_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
> +#define F2FS_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
> +#endif
> +
> +/*
>   * For INODE and NODE manager
>   */
>  #define XATTR_NODE_OFFSET	(-1)	/*
> @@ -850,6 +864,7 @@ void f2fs_truncate(struct inode *);
>  int f2fs_setattr(struct dentry *, struct iattr *);
>  int truncate_hole(struct inode *, pgoff_t, pgoff_t);
>  long f2fs_ioctl(struct file *, unsigned int, unsigned long);
> +long f2fs_compat_ioctl(struct file *, unsigned int, unsigned long);
>
>  /*
>   * inode.c
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 633667e..e79d26a 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -644,6 +644,23 @@ out:
>  	}
>  }
>
> +#ifdef CONFIG_COMPAT
> +long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long
> arg)
> +{
> +	switch (cmd) {
> +	case F2FS_IOC32_GETFLAGS:
> +		cmd = F2FS_IOC_GETFLAGS;
> +		break;
> +	case F2FS_IOC32_SETFLAGS:
> +		cmd = F2FS_IOC_SETFLAGS;
> +		break;
> +	default:
> +		return -ENOIOCTLCMD;
> +	}
> +	return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
> +}
> +#endif
> +
>  const struct file_operations f2fs_file_operations = {
>  	.llseek		= generic_file_llseek,
>  	.read		= do_sync_read,
> @@ -655,6 +672,9 @@ const struct file_operations f2fs_file_operations = {
>  	.fsync		= f2fs_sync_file,
>  	.fallocate	= f2fs_fallocate,
>  	.unlocked_ioctl	= f2fs_ioctl,
> +#ifdef CONFIG_COMPAT
> +	.compat_ioctl	= f2fs_compat_ioctl,
> +#endif
>  	.splice_read	= generic_file_splice_read,
>  	.splice_write	= generic_file_splice_write,
>  };
> --
> 1.7.9.5
>
>
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