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

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Date:	Tue, 5 Feb 2013 16:02:35 +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 <namjae.jeon@...sung.com>,
	Amit Sahrawat <a.sahrawat@...sung.com>
Subject: Re: [PATCH] f2fs: add compat_ioctl to provide backward compatability

2013/2/5, Jaegeuk Kim <jaegeuk.kim@...sung.com>:
> Hi,
>
> 2013-02-05 (화), 14:28 +0900, Namjae Jeon:
>> Hi Jaegeuk.
>>
>> Oops!, I was missing include header.
>> Sorry, I will send v2 patch again.
>
> I got a build error, and simply added the following header file in your
> patch.
>
> #include <linux/compat.h>
>
> Is it correct?
Yes, Right :) It should be needed.
Sorry for my mistake again. Could you add this header instead of me
?(because I can resend the patch tonight....).

Thanks!
>
> Thanks,
>
>>
>> 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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>
> --
> Jaegeuk Kim
> Samsung
>
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