Re: [PATCH 2/7] mm: Protect operations adding pages to page cache with i_mapping_lock

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>  	if (error == AOP_TRUNCATED_PAGE)
>  		put_page(page);
> +	up_read(&mapping->host->i_mapping_sem);
>  	return error;

Please add an unlock_mapping label above this up_read and consolidate
most of the other unlocks by jumping there (put_and_wait_on_page_locked
probablt can't use it).

>  truncated:
>  	unlock_page(page);
> @@ -2309,6 +2324,7 @@ static int filemap_update_page(struct kiocb *iocb,
>  	return AOP_TRUNCATED_PAGE;

The trunated case actually seems to miss the unlock.

Similarly I think filemap_fault would benefit from a common
unlock path.



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