Re: [PATCH 03/11] mm: Protect operations adding pages to page cache with invalidate_lock

Matthew Wilcox
2021-05-12T14:21:44Z

On Wed, May 12, 2021 at 03:46:11PM +0200, Jan Kara wrote:

> diff --git a/mm/truncate.c b/mm/truncate.c
> index 57a618c4a0d6..93bde2741e0e 100644
> --- a/mm/truncate.c
> +++ b/mm/truncate.c
> @@ -415,7 +415,7 @@ EXPORT_SYMBOL(truncate_inode_pages_range);
> * @mapping: mapping to truncate
> * @lstart: offset from which to truncate
> *
> - * Called under (and serialised by) inode->i_rwsem.
> + * Called under (and serialised by) inode->i_rwsem and inode->i_mapping_rwsem.

mapping->invalidate_lock, surely? And could we ask lockdep to assert
this for us instead of just a comment?

> *
> * Note: When this function returns, there can be a page in the process of
> * deletion (inside __delete_from_page_cache()) in the specified range. Thus
> --
> 2.26.2
>
>