linux-ext4 - Re: [PATCH] fscrypt: support decrypting data from large folios

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Message-ID: <Y9RfZaGoQ07UkD6w@casper.infradead.org>
Date:   Fri, 27 Jan 2023 23:33:57 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     linux-fscrypt@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org
Subject: Re: [PATCH] fscrypt: support decrypting data from large folios

On Fri, Jan 27, 2023 at 02:42:02PM -0800, Eric Biggers wrote:
> +++ b/fs/buffer.c
> @@ -307,8 +307,8 @@ static void decrypt_bh(struct work_struct *work)
>  	struct buffer_head *bh = ctx->bh;
>  	int err;
>  
> -	err = fscrypt_decrypt_pagecache_blocks(bh->b_page, bh->b_size,
> -					       bh_offset(bh));
> +	err = fscrypt_decrypt_pagecache_blocks(page_folio(bh->b_page),
> +					       bh->b_size, bh_offset(bh));

FYI, Andrew's been carrying "buffer: add b_folio as an alias of b_page"
in his tree since mid-December.  buffer_heads always point to the
head page, aka folio.

This all looks good to me.

Reviewed-by: Matthew Wilcox (Oracle) <willy@...radead.org>