From: Matthew Wilcox <willy@infradead.org>
To: Eric Biggers <ebiggers@kernel.org>
Cc: Dave Chinner <david@fromorbit.com>,
Satya Tangirala <satyat@google.com>,
linux-fscrypt@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-f2fs-devel@lists.sourceforge.net,
linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org
Subject: Re: [PATCH v4 3/7] iomap: support direct I/O with fscrypt using blk-crypto
Date: Wed, 22 Jul 2020 23:44:07 +0100 [thread overview]
Message-ID: <20200722224407.GR15516@casper.infradead.org> (raw)
In-Reply-To: <20200722223404.GA76479@sol.localdomain>
On Wed, Jul 22, 2020 at 03:34:04PM -0700, Eric Biggers wrote:
> > Which means you are now placing a new constraint on this code in
> > that we cannot ever, in future, zero entire blocks here.
> >
> > This code can issue arbitrary sized zeroing bios - multiple entire fs blocks
> > blocks if necessary - so I think constraining it to only support
> > partial block zeroing by adding a warning like this is no correct.
>
> In v3 and earlier this instead had the code to set an encryption context:
>
> fscrypt_set_bio_crypt_ctx(bio, inode, pos >> inode->i_blkbits,
> GFP_KERNEL);
>
> Would you prefer that, even though the call to fscrypt_set_bio_crypt_ctx() would
> always be a no-op currently (since for now, iomap_dio_zero() will never be
> called with an encrypted file) and thus wouldn't be properly tested?
>
> BTW, iomap_dio_zero() is actually limited to one page, so it's not quite
> "arbitrary sizes".
I have a patch for that
http://git.infradead.org/users/willy/pagecache.git/commitdiff/1a4d72a890ca9c2ea3d244a6153511ae674ce1d8
It's not going to cause a problem for crossing a 2^32 boundary because
pages are naturally aligned and don't get that big.
next prev parent reply other threads:[~2020-07-22 22:44 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-20 23:37 [PATCH v4 0/7] add support for direct I/O with fscrypt using blk-crypto Satya Tangirala
2020-07-20 23:37 ` [PATCH v4 1/7] fscrypt: Add functions for direct I/O support Satya Tangirala
2020-07-22 17:04 ` Jaegeuk Kim
2020-07-20 23:37 ` [PATCH v4 2/7] direct-io: add support for fscrypt using blk-crypto Satya Tangirala
2020-07-22 17:05 ` Jaegeuk Kim
2020-07-20 23:37 ` [PATCH v4 3/7] iomap: support direct I/O with " Satya Tangirala
2020-07-22 17:06 ` Jaegeuk Kim
2020-07-22 21:16 ` Dave Chinner
2020-07-22 22:34 ` Eric Biggers
2020-07-22 22:44 ` Matthew Wilcox [this message]
2020-07-22 23:12 ` Eric Biggers
2020-07-22 23:26 ` Eric Biggers
2020-07-22 23:32 ` Darrick J. Wong
2020-07-22 23:43 ` Eric Biggers
2020-07-23 22:07 ` Dave Chinner
2020-07-23 23:03 ` Eric Biggers
2020-07-24 1:39 ` Dave Chinner
2020-07-24 3:46 ` Eric Biggers
2020-07-24 5:31 ` Dave Chinner
2020-07-24 17:41 ` Eric Biggers
2020-07-25 23:47 ` Dave Chinner
2020-07-25 23:59 ` Dave Chinner
2020-07-26 2:42 ` Eric Biggers
2020-07-27 17:16 ` Eric Biggers
2020-07-20 23:37 ` [PATCH v4 4/7] ext4: " Satya Tangirala
2020-07-22 17:07 ` Jaegeuk Kim
2020-07-20 23:37 ` [PATCH v4 5/7] f2fs: " Satya Tangirala
2020-07-21 20:11 ` Jaegeuk Kim
2020-07-20 23:37 ` [PATCH v4 6/7] fscrypt: document inline encryption support Satya Tangirala
2020-07-22 17:01 ` Jaegeuk Kim
2020-07-20 23:37 ` [PATCH v4 7/7] fscrypt: update documentation for direct I/O support Satya Tangirala
2020-07-21 0:47 ` Eric Biggers
2020-07-22 16:57 ` Jaegeuk Kim
2020-07-21 0:56 ` [PATCH v4 0/7] add support for direct I/O with fscrypt using blk-crypto Eric Biggers
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