Re: [PATCH v3 2/3] fs: add check functions for sb_start_{write,pagefault,intwrite}

[Filipe Manana <fdmanana@kernel.org>]

On Mon, Mar 28, 2022 at 03:29:21PM +0900, Naohiro Aota wrote:
> Add a function sb_write_started() to return if sb_start_write() is
> properly called. It is used in the next commit.
> 
> Reviewed-by: Filipe Manana <fdmanana@suse.com>
> Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
> ---
>  include/linux/fs.h | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 27746a3da8fd..57fedc4af4a1 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -1732,6 +1732,11 @@ static inline bool __sb_start_write_trylock(struct super_block *sb, int level)
>  #define __sb_writers_release(sb, lev)	\
>  	percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_)
>  
> +static inline bool sb_write_started(struct super_block *sb)

The argument can be made const.

Also, the subject "fs: add check functions for sb_start_{write,pagefault,intwrite}" is
now oudated, since only sb_write_started() is added.

Thanks.

> +{
> +	return lockdep_is_held_type(sb->s_writers.rw_sem + SB_FREEZE_WRITE - 1, 1);
> +}
> +
>  /**
>   * sb_end_write - drop write access to a superblock
>   * @sb: the super we wrote to
> -- 
> 2.35.1
>