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Message-ID: <CAHc6FU4FdeceDTZHDN4NtH2oA2Yq-XcmAceVaSJY3y2g40-w0g@mail.gmail.com> Date: Mon, 26 Jun 2017 12:51:29 +0200 From: Andreas Gruenbacher <agruenba@...hat.com> To: Christoph Hellwig <hch@...radead.org> Cc: linux-fsdevel <linux-fsdevel@...r.kernel.org>, linux-ext4 <linux-ext4@...r.kernel.org>, linux-xfs@...r.kernel.org, Jan Kara <jack@...e.cz> Subject: Re: [PATCH 1/3] vfs: Add page_cache_seek_hole_data helper On Mon, Jun 26, 2017 at 12:41 PM, Christoph Hellwig <hch@...radead.org> wrote: > On Fri, Jun 23, 2017 at 02:19:31AM +0200, Andreas Gruenbacher wrote: >> Both ext4 and xfs implement seeking for the next hole or piece of data >> in unwritten extents by scanning the page cache, and both versions share >> the same bug when iterating the buffers of a page: the start offset into >> the page isn't taken into account, so when a page fits more than two >> filesystem blocks, things will go wrong. For example, on a filesystem >> with a block size of 1k, the following command will fail: >> >> xfs_io -f -c "falloc 0 4k" \ >> -c "pwrite 1k 1k" \ >> -c "pwrite 3k 1k" \ >> -c "seek -a -r 0" foo > > Can you wire this up for xfstests, please? I did: https://marc.info/?l=fstests&m=149817668119033 Andreas
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