Linux-Fsdevel Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Chandan Rajendra <chandan@linux.vnet.ibm.com>
To: Eric Biggers <ebiggers3@gmail.com>
Cc: linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, tytso@mit.edu
Subject: Re: [RFC PATCH 0/8] Ext4 encryption support for blocksize < pagesize
Date: Wed, 17 Jan 2018 19:13:49 +0530	[thread overview]
Message-ID: <4752190.CyFFPQ5jaq@localhost.localdomain> (raw)
In-Reply-To: <20180117021020.GA4477@zzz.localdomain>

On Wednesday, January 17, 2018 7:40:20 AM IST Eric Biggers wrote:
> Hi Chandan,
> 
> On Fri, Jan 12, 2018 at 07:41:21PM +0530, Chandan Rajendra wrote:
> > This patchset implements code to support encryption of Ext4 filesystem
> > instances that have blocksize less than pagesize. The patchset has
> > been tested on both ppc64 and x86_64 machines.
> > 
> > This patchset changes the prototype of the function
> > fscrypt_encrypt_page(). I will make the relevant changes to the rest
> > of the filesystems (e.g. f2fs) and post them in the next version of
> > the patchset.
> > 
> > Chandan Rajendra (8):
> >   ext4: use EXT4_INODE_ENCRYPT flag to detect encrypted bio
> >   fs/buffer.c: make some functions non-static
> >   ext4: decrypt all contiguous blocks in a page
> >   ext4: decrypt all boundary blocks when doing buffered write
> >   ext4: decrypt the block that needs to be partially zeroed
> >   ext4: encrypt blocks whose size is less than page size
> >   ext4: decrypt blocks whose size is less than page size
> >   ext4: enable encryption for blocksize less than page size
> > 
> 
> Thanks for working on this!  We've wanted this for a while (both so that it
> works on PowerPC with a 64K PAGE_SIZE, and so that people can't screw up their
> 1K blocksize filesystems by enabling the 'encrypt' flag), but no one ever got
> around to it.  And it's not easy!
> 
> First, just a few notes that didn't fit into my comments for the individual
> patches.
> 
> Updating fscrypt_zeroout_range() seems to have been missed.  Currently it
> assumes block_size == PAGE_SIZE so it will need to be updated too.
> 
> The file Documentation/filesystems/fscrypt.rst will also need to be updated, at
> least to remove the following sentence: "Currently, only the case where the
> filesystem block size is equal to the system's page size (usually 4096 bytes) is
> supported.".

Thanks a lot for the review comments. I will make sure to take care of them
in the next version of the patchset.

> 
> Also, on future versions of this patchset can you please also Cc
> linux-fscrypt@vger.kernel.org?
> 

Sure, I will do that.

-- 
chandan

      reply	other threads:[~2018-01-17 13:42 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-12 14:11 Chandan Rajendra
2018-01-12 14:11 ` [RFC PATCH 1/8] ext4: use EXT4_INODE_ENCRYPT flag to detect encrypted bio Chandan Rajendra
2018-01-12 19:04   ` Randy Dunlap
2018-01-13  5:22     ` Chandan Rajendra
2018-01-12 14:11 ` [RFC PATCH 2/8] fs/buffer.c: make some functions non-static Chandan Rajendra
2018-01-12 14:38   ` Matthew Wilcox
2018-01-13  5:25     ` Chandan Rajendra
2018-01-17  2:14   ` Eric Biggers
2018-01-12 14:11 ` [RFC PATCH 3/8] ext4: decrypt all contiguous blocks in a page Chandan Rajendra
2018-01-17  2:18   ` Eric Biggers
2018-01-12 14:11 ` [RFC PATCH 4/8] ext4: decrypt all boundary blocks when doing buffered write Chandan Rajendra
2018-01-17  2:22   ` Eric Biggers
2018-01-12 14:11 ` [RFC PATCH 5/8] ext4: decrypt the block that needs to be partially zeroed Chandan Rajendra
2018-01-17  2:23   ` Eric Biggers
2018-01-12 14:11 ` [RFC PATCH 6/8] ext4: encrypt blocks whose size is less than page size Chandan Rajendra
2018-01-17  2:33   ` Eric Biggers
2018-01-12 14:11 ` [RFC PATCH 7/8] ext4: decrypt " Chandan Rajendra
2018-01-17  2:39   ` Eric Biggers
2018-01-12 14:11 ` [RFC PATCH 8/8] ext4: enable encryption for blocksize " Chandan Rajendra
2018-01-17  2:40   ` Eric Biggers
2018-01-17 13:42     ` Chandan Rajendra
2018-01-12 19:07 ` [RFC PATCH 0/8] Ext4 encryption support for blocksize < pagesize Randy Dunlap
2018-01-13  5:28   ` Chandan Rajendra
2018-01-13 12:48     ` Matthew Wilcox
2018-01-13 18:20       ` Randy Dunlap
2018-01-17  2:10 ` Eric Biggers
2018-01-17 13:43   ` Chandan Rajendra [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=4752190.CyFFPQ5jaq@localhost.localdomain \
    --to=chandan@linux.vnet.ibm.com \
    --cc=ebiggers3@gmail.com \
    --cc=linux-ext4@vger.kernel.org \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=tytso@mit.edu \
    --subject='Re: [RFC PATCH 0/8] Ext4 encryption support for blocksize < pagesize' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).