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From: Christoph Hellwig <hch@lst.de>
To: linux-xfs@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org,
        linux-mm@kvack.org
Subject: buffered I/O without buffer heads in xfs and iomap v2
Date: Fri, 18 May 2018 18:47:56 +0200
Message-Id: <20180518164830.1552-1-hch@lst.de>
Sender: linux-block-owner@vger.kernel.org
List-Id: linux-block@vger.kernel.org

Hi all,

this series adds support for buffered I/O without buffer heads to
the iomap and XFS code.

For now this series only contains support for block size == PAGE_SIZE,
with the 4k support split into a separate series.


A git tree is available at:

    git://git.infradead.org/users/hch/xfs.git xfs-iomap-read.2

Gitweb:

    http://git.infradead.org/users/hch/xfs.git/shortlog/refs/heads/xfs-iomap-read.2

Changes since v1:
 - fix the iomap_readpages error handling
 - use unsigned file offsets in a few places to avoid arithmetic overflows
 - allocate a iomap_page in iomap_page_mkwrite to fix generic/095
 - improve a few comments
 - add more asserts
 - warn about truncated block numbers from ->bmap
 - new patch to change the __do_page_cache_readahead return value to
   unsigned int
 - remove an incorrectly added empty line
 - make inline data an explicit iomap type instead of a flag
 - add a IOMAP_F_BUFFER_HEAD flag to force use of buffers heads for gfs2,
   and keep the basic buffer head infrastructure around for now.