linux-kernel - Re: [RFC] FS_IOC

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Date:	Fri, 23 Jul 2010 18:24:43 +0200
From:	Jan Kara <jack@...e.cz>
To:	Sage Weil <sage@...dream.net>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] FS_IOC_SYNCFS

On Tue 20-07-10 16:48:26, Sage Weil wrote:
> As far as I can see, currently the only way to sync a single file system 
> (and not _all_ mounted file systems) is via the BLKFLSBUF ioctl, which 
> will sync_filesystem() and then invalidate_bdev().  If you _just_ want to 
> sync, though, the invalidate_bdev() is unnecessary and potentially 
> counter-productive.
> 
> Would it be reasonable to add a simple call like so?  Then you could
> 
> 	fd = open("/path/for/some/mount", O_RDONLY);
> 	ioctl(fd, FS_IOC_SYNCFS);
> 	close(fd);
> 
> or something along those lines.
  Looks reasonable to me...

								Honza

> diff --git a/fs/ioctl.c b/fs/ioctl.c
> index 2d140a7..0bc9f7a 100644
> --- a/fs/ioctl.c
> +++ b/fs/ioctl.c
> @@ -593,6 +593,9 @@ int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
>  	case FS_IOC_FIEMAP:
>  		return ioctl_fiemap(filp, arg);
>  
> +	case FS_IOC_SYNCFS:
> +		return sync_filesystem(filp->f_dentry->d_sb);
> +
>  	case FIGETBSZ:
>  	{
>  		struct inode *inode = filp->f_path.dentry->d_inode;
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 471e1ff..4a84d78 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -321,6 +321,7 @@ struct inodes_stat_t {
>  #define	FS_IOC_GETVERSION		_IOR('v', 1, long)
>  #define	FS_IOC_SETVERSION		_IOW('v', 2, long)
>  #define FS_IOC_FIEMAP			_IOWR('f', 11, struct fiemap)
> +#define FS_IOC_SYNCFS                   _IO('S', 12)
>  #define FS_IOC32_GETFLAGS		_IOR('f', 1, int)
>  #define FS_IOC32_SETFLAGS		_IOW('f', 2, int)
>  #define FS_IOC32_GETVERSION		_IOR('v', 1, int)
> --
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-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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