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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.

  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 " 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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