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

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Date:	Tue, 05 Feb 2013 15:45:19 +0900
From:	Jaegeuk Kim <jaegeuk.kim@...sung.com>
To:	Namjae Jeon <linkinjeon@...il.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

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?

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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