On Thu 30-07-15 13:48:01, Dongsheng Yang wrote:
> As we have cdev in superblock now, we can provide get_super_cdev
> to get super_block by a cdev reference, similar with get_super
> which is working only for block_device.
The patch looks good to me. You can add:
Reviewed-by: Jan Kara <jack@xxxxxxxx>
Honza
>
> Signed-off-by: Dongsheng Yang <yangds.fnst@xxxxxxxxxxxxxx>
> ---
> fs/super.c | 15 +++++++++++++++
> include/linux/fs.h | 1 +
> 2 files changed, 16 insertions(+)
>
> diff --git a/fs/super.c b/fs/super.c
> index 46fd1f1..4c56dff 100644
> --- a/fs/super.c
> +++ b/fs/super.c
> @@ -613,6 +613,21 @@ struct super_block *get_super(struct block_device *bdev)
> }
> EXPORT_SYMBOL(get_super);
>
> +static int cdev_compare(struct super_block *sb, void *key)
> +{
> + return (sb->s_cdev == (struct cdev *)key);
> +}
> +
> +/**
> + * get_super_cdev - get the superblock of a cdev
> + * @cdev: char device to get the superblock for
> + */
> +struct super_block *get_super_cdev(struct cdev *cdev)
> +{
> + return __get_super(cdev_compare, cdev);
> +}
> +EXPORT_SYMBOL(get_super_cdev);
> +
> /**
> * get_super_thawed - get thawed superblock of a device
> * @bdev: device to get the superblock for
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 2f1d9499..e5ea425a 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -2744,6 +2744,7 @@ extern void get_filesystem(struct file_system_type *fs);
> extern void put_filesystem(struct file_system_type *fs);
> extern struct file_system_type *get_fs_type(const char *name);
> extern struct super_block *get_super(struct block_device *);
> +extern struct super_block *get_super_cdev(struct cdev *);
> extern struct super_block *get_super_thawed(struct block_device *);
> extern struct super_block *get_active_super(struct block_device *bdev);
> extern void drop_super(struct super_block *sb);
> --
> 1.8.4.2
>
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
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