linux-kernel - Re: [PATCH mmotm 4/6] nilfs2: use unlocked

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Date:	Tue, 17 Feb 2009 13:26:13 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH mmotm 4/6] nilfs2: use unlocked_ioctl

Hi Ryusuke,

On Tue, 2009-02-17 at 16:42 +0900, Ryusuke Konishi wrote:
> Pekka Enberg suggested converting ->ioctl operations to use
> ->unlocked_ioctl to avoid BKL.
> 
> The conversion was verified to be safe, so I will take it on this
> occasion.
> 
> Cc: Pekka Enberg <penberg@...helsinki.fi>
> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
> ---
>  fs/nilfs2/dir.c   |    2 +-
>  fs/nilfs2/file.c  |    2 +-
>  fs/nilfs2/ioctl.c |    4 ++--
>  fs/nilfs2/nilfs.h |    2 +-
>  4 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/nilfs2/dir.c b/fs/nilfs2/dir.c
> index 393316c..54100ac 100644
> --- a/fs/nilfs2/dir.c
> +++ b/fs/nilfs2/dir.c
> @@ -702,7 +702,7 @@ struct file_operations nilfs_dir_operations = {
>  	.llseek		= generic_file_llseek,
>  	.read		= generic_read_dir,
>  	.readdir	= nilfs_readdir,
> -	.ioctl		= nilfs_ioctl,
> +	.unlocked_ioctl	= nilfs_ioctl,
>  #ifdef CONFIG_COMPAT
>  	.compat_ioctl	= nilfs_ioctl,
>  #endif	/* CONFIG_COMPAT */
> diff --git a/fs/nilfs2/file.c b/fs/nilfs2/file.c
> index 1670038..df74577 100644
> --- a/fs/nilfs2/file.c
> +++ b/fs/nilfs2/file.c
> @@ -138,7 +138,7 @@ struct file_operations nilfs_file_operations = {
>  	.write		= do_sync_write,
>  	.aio_read	= generic_file_aio_read,
>  	.aio_write	= generic_file_aio_write,
> -	.ioctl		= nilfs_ioctl,
> +	.unlocked_ioctl	= nilfs_ioctl,
>  #ifdef CONFIG_COMPAT
>  	.compat_ioctl	= nilfs_ioctl,
>  #endif	/* CONFIG_COMPAT */
> diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
> index 33aff88..cfb2789 100644
> --- a/fs/nilfs2/ioctl.c
> +++ b/fs/nilfs2/ioctl.c
> @@ -600,9 +600,9 @@ static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
>  	return 0;
>  }
>  
> -int nilfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
> -		unsigned long arg)
> +long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>  {
> +	struct inode *inode = filp->f_dentry->d_inode;
>  	void __user *argp = (void * __user *)arg;
>  
>  	switch (cmd) {
> diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h
> index ad17fa9..f865ecb 100644
> --- a/fs/nilfs2/nilfs.h
> +++ b/fs/nilfs2/nilfs.h
> @@ -242,7 +242,7 @@ extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *,
>  extern int nilfs_sync_file(struct file *, struct dentry *, int);
>  
>  /* ioctl.c */
> -int nilfs_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
> +long nilfs_ioctl(struct file *, unsigned int, unsigned long);
>  int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, void __user *);
>  
>  /* inode.c */

Maybe I'm looking at an old version of nilfs but don't you need to
remove nilfs_compat_locked_ioctl() and the lock_kernel()/unlock_kernel()
from nilfs_ioctl_timedwait() as well?

			Pekka

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