Re: [RFC 1/2] iomap: direct-io: Move inode_dio_begin before filemap_write_and_wait_range

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To: Jan Kara <jack@xxxxxxx>
Subject: Re: [RFC 1/2] iomap: direct-io: Move inode_dio_begin before filemap_write_and_wait_range
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 14 Jan 2020 08:38:18 -0800
Cc: "Darrick J. Wong" <darrick.wong@xxxxxxxxxx>, Ritesh Harjani <riteshh@xxxxxxxxxxxxx>, linux-ext4@xxxxxxxxxxxxxxx, tytso@xxxxxxx
In-reply-to: <20200114090507.GA6466@quack2.suse.cz>
References: <cover.1578907890.git.riteshh@linux.ibm.com> <27607a16327fe9664f32d09abe565af0d1ae56c9.1578907891.git.riteshh@linux.ibm.com> <20200113215159.GA8235@magnolia> <20200114090507.GA6466@quack2.suse.cz>

On Tue, Jan 14, 2020 at 10:05:07AM +0100, Jan Kara wrote:
> 
> Well, XFS always performs buffered writeback using unwritten extents so at
> least the immediate problem of stale data exposure ext4 has does not happen
> there AFAICT. 

Currently XFS never uses unwritten extents when converting delalloc
extents.

Follow-Ups:
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References:
- [RFC 0/2] ext4: Fix stale data read exposure problem with DIO read/page_mkwrite
  - From: Ritesh Harjani
- [RFC 1/2] iomap: direct-io: Move inode_dio_begin before filemap_write_and_wait_range
  - From: Ritesh Harjani
- Re: [RFC 1/2] iomap: direct-io: Move inode_dio_begin before filemap_write_and_wait_range
  - From: Darrick J. Wong
- Re: [RFC 1/2] iomap: direct-io: Move inode_dio_begin before filemap_write_and_wait_range
  - From: Jan Kara

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