linux-ext4 - Re: [PATCH 01/22] ext4: add ext4_mpage

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Message-Id: <85D94901-4D36-45F3-A57C-0D6010DE18FA@dilger.ca>
Date:	Mon, 6 Apr 2015 15:08:51 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	jaegeuk@...nel.org, mhalcrow@...gle.com
Subject: Re: [PATCH 01/22] ext4: add ext4_mpage_readpages()

On Apr 2, 2015, at 4:10 PM, Theodore Ts'o <tytso@....edu> wrote:
> 
> This takes code from fs/mpage.c and optimizes it for ext4.  Its
> primary reason is to allow us to more easily add encryption to ext4's
> read path in an efficient manner.
> 
[snip]
> diff --git a/fs/ext4/readpage.c b/fs/ext4/readpage.c
> new file mode 100644
> index 0000000..9ca4dfc
> --- /dev/null
> +++ b/fs/ext4/readpage.c
> @@ -0,0 +1,261 @@
> +/*
> + * linux/fs/ext4/readpage.c
> + *
> + * This was originally taken from fs/mpage.c
> + *
> + * The intent is the ext4_mpage_readpages() function here is intended
> + * to replace mpage_readpages() in the general case, not just for
> + * encrypted files.  It has some limitations (see below), where it
> + * will fall back to read_block_full_page(), but these limitations
> + * should never be hit when page_size != block_size.

Shouldn't this be "... should never be hit when page_size == block_size"?
Otherwise, we'd hit them almost all the time...

Cheers, Andreas




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