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Date:   Tue, 13 Apr 2021 13:57:46 +0100
From:   Christoph Hellwig <>
To:     Jan Kara <>
Cc:,,, Ted Tso <>,
        Christoph Hellwig <>,
        Amir Goldstein <>,
        Dave Chinner <>
Subject: Re: [PATCH 2/7] mm: Protect operations adding pages to page cache
 with i_mapping_lock

>  	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,

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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