On Mon, 13 Dec 2010 15:22:14 +0800
Shaohua Li <shaohua.li@xxxxxxxxx> wrote:
> Add metadata readahead ioctl in vfs. Filesystem can hook to
> super_operations.metadata_readahead to handle filesystem specific task.
> Next patch will give an example how btrfs implements it.
>
> Signed-off-by: Shaohua Li <shaohua.li@xxxxxxxxx>
>
> ---
> fs/compat_ioctl.c | 1 +
> fs/ioctl.c | 21 +++++++++++++++++++++
> include/linux/fs.h | 8 ++++++++
> 3 files changed, 30 insertions(+)
>
> Index: linux/fs/ioctl.c
> ===================================================================
> --- linux.orig/fs/ioctl.c 2010-12-13 14:01:56.000000000 +0800
> +++ linux/fs/ioctl.c 2010-12-13 14:10:42.000000000 +0800
> @@ -605,6 +605,24 @@ static int ioctl_metadata_incore(struct
> return entries;
> }
>
> +static int ioctl_metadata_readahead(struct file *filp, void __user *argp)
> +{
> + struct super_block *sb = filp->f_path.dentry->d_inode->i_sb;
> + struct metadata_readahead_args args;
> +
> + if (!sb->s_op->metadata_readahead)
> + return -EOPNOTSUPP;
-ENOTNETWORKING
> + if (copy_from_user(&args, (struct metadata_readahead_args __user *)argp,
Unneeded cast.
> + sizeof(args)))
> + return -EFAULT;
> +
> + if ((args.offset & ~PAGE_CACHE_MASK) || (args.size & ~PAGE_CACHE_MASK))
Why?
> + return -EINVAL;
> +
> + return sb->s_op->metadata_readahead(sb, args.offset, args.size);
> +}
> +
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