linux-kernel - Re: oops in file

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Date:	Thu, 23 Oct 2008 14:23:37 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Manish Lachwani <mlachwani@...il.com>
cc:	USB list <linux-usb@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: oops in file_storage.c

On Thu, 23 Oct 2008, Manish Lachwani wrote:

> Hi Alan,
> 
> Yes, I am trying out the changes below. Will let you know how it goes.
> If it works well, I will send an updated patch.
> 
> diff --git a/drivers/usb/gadget/file_storage.c
> b/drivers/usb/gadget/file_storage.c
> index 3e807f0..844f992 100644
> --- a/drivers/usb/gadget/file_storage.c
> +++ b/drivers/usb/gadget/file_storage.c
> @@ -1927,26 +1927,11 @@ static int do_write(struct fsg_dev *fsg)
>  static int fsync_sub(struct lun *curlun)
>  {
>         struct file     *filp = curlun->filp;
> -       struct inode    *inode;
> -       int             rc, err;
> 
>         if (curlun->ro || !filp)
>                 return 0;
> -       if (!filp->f_op || !filp->f_op->fsync)
> -               return -EINVAL;
> 
> -       inode = filp->f_path.dentry->d_inode;
> -       mutex_lock(&inode->i_mutex);
> -       rc = filemap_fdatawrite(inode->i_mapping);
> -       err = filp->f_op->fsync(filp, filp->f_path.dentry, 1);
> -       if (!rc)
> -               rc = err;
> -       err = filemap_fdatawait(inode->i_mapping);
> -       if (!rc)
> -               rc = err;
> -       mutex_unlock(&inode->i_mutex);
> -       VLDBG(curlun, "fdatasync -> %d\n", rc);
> -       return rc;
> +       return do_fsync(filp, 0);

The fsync call above uses 1, not 0.

>  }
> 
>  static void fsync_all(struct fsg_dev *fsg)
> diff --git a/fs/sync.c b/fs/sync.c
> index e700eb1..53ff1f3 100644
> --- a/fs/sync.c
> +++ b/fs/sync.c
> @@ -111,6 +111,7 @@ long do_fsync(struct file *file, int datasync)
>  out:
>         return ret;
>  }
> +EXPORT_SYMBOL(do_fsync);
> 
>  static long __do_fsync(unsigned int fd, int datasync)
>  {

Apart from that one mistake, this is fine with me.  But you should 
check with the core kernel developers; there may an objection to 
exporting do_fsync().

Alan Stern

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