linux-kernel - Re: [PATCH v2] ceph: invalidate pages when doing DIO in encrypted inodes

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Message-ID: <d6407dd1-b6df-4de4-fe37-71b765b2088a@redhat.com>
Date:   Wed, 6 Apr 2022 14:28:27 +0800
From:   Xiubo Li <xiubli@...hat.com>
To:     Luís Henriques <lhenriques@...e.de>,
        Jeff Layton <jlayton@...nel.org>,
        Ilya Dryomov <idryomov@...il.com>
Cc:     ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ceph: invalidate pages when doing DIO in encrypted
 inodes


On 4/1/22 9:32 PM, Luís Henriques wrote:
> When doing DIO on an encrypted node, we need to invalidate the page cache in
> the range being written to, otherwise the cache will include invalid data.
>
> Signed-off-by: Luís Henriques <lhenriques@...e.de>
> ---
>   fs/ceph/file.c | 11 ++++++++++-
>   1 file changed, 10 insertions(+), 1 deletion(-)
>
> Changes since v1:
> - Replaced truncate_inode_pages_range() by invalidate_inode_pages2_range
> - Call fscache_invalidate with FSCACHE_INVAL_DIO_WRITE if we're doing DIO
>
> Note: I'm not really sure this last change is required, it doesn't really
> affect generic/647 result, but seems to be the most correct.
>
> diff --git a/fs/ceph/file.c b/fs/ceph/file.c
> index 5072570c2203..b2743c342305 100644
> --- a/fs/ceph/file.c
> +++ b/fs/ceph/file.c
> @@ -1605,7 +1605,7 @@ ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
>   	if (ret < 0)
>   		return ret;
>   
> -	ceph_fscache_invalidate(inode, false);
> +	ceph_fscache_invalidate(inode, (iocb->ki_flags & IOCB_DIRECT));
>   	ret = invalidate_inode_pages2_range(inode->i_mapping,
>   					    pos >> PAGE_SHIFT,
>   					    (pos + count - 1) >> PAGE_SHIFT);

The above has already invalidated the pages, why doesn't it work ?

-- Xiubo

> @@ -1895,6 +1895,15 @@ ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
>   		req->r_inode = inode;
>   		req->r_mtime = mtime;
>   
> +		if (IS_ENCRYPTED(inode) && (iocb->ki_flags & IOCB_DIRECT)) {
> +			ret = invalidate_inode_pages2_range(
> +				inode->i_mapping,
> +				write_pos >> PAGE_SHIFT,
> +				(write_pos + write_len - 1) >> PAGE_SHIFT);
> +			if (ret < 0)
> +				dout("invalidate_inode_pages2_range returned %d\n", ret);
> +		}
> +
>   		/* Set up the assertion */
>   		if (rmw) {
>   			/*
>