From: David Howells <dhowells@redhat.com>
To: Christoph Hellwig <hch@lst.de>
Cc: dhowells@redhat.com, Carlos Maiolino <cmaiolino@redhat.com>,
linux-fsdevel@vger.kernel.org, adilger@dilger.ca,
jaegeuk@kernel.org, darrick.wong@oracle.com, miklos@szeredi.hu,
rpeterso@redhat.com, linux-xfs@vger.kernel.org
Subject: Re: [PATCH 2/9] cachefiles: drop direct usage of ->bmap method.
Date: Sat, 31 Aug 2019 01:45:57 +0100 [thread overview]
Message-ID: <28402.1567212357@warthog.procyon.org.uk> (raw)
In-Reply-To: <20190830165920.GA28182@lst.de>
Christoph Hellwig <hch@lst.de> wrote:
> We'll you'd need to implement a IOCB_NOHOLE, but that wouldn't be all
> that hard. Having a READ_PLUS like interface that actually tells you
> how large the hole is might be hard.
Actually, that raises another couple of questions:
(1) Is a filesystem allowed to join up two disjoint blocks of data with a
block of zeros to make a single extent? If this happens, I'll see the
inserted block of zeros to be valid data.
(2) Is a filesystem allowed to punch out a block of valid zero data to make a
hole? This would cause me to refetch the data.
David
next prev parent reply other threads:[~2019-08-31 0:46 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-08 8:27 [PATCH 0/9 V5] New ->fiemap infrastructure and ->bmap removal Carlos Maiolino
2019-08-08 8:27 ` [PATCH 1/9] fs: Enable bmap() function to properly return errors Carlos Maiolino
2019-08-08 21:24 ` kbuild test robot
2019-08-14 11:14 ` Christoph Hellwig
2019-08-20 11:36 ` Carlos Maiolino
2019-08-08 8:27 ` [PATCH 2/9] cachefiles: drop direct usage of ->bmap method Carlos Maiolino
2019-08-14 11:15 ` Christoph Hellwig
2019-08-20 11:57 ` Carlos Maiolino
2019-08-20 12:50 ` David Howells
2019-08-29 7:13 ` Christoph Hellwig
2019-08-30 16:17 ` David Howells
2019-08-30 16:59 ` Christoph Hellwig
2019-08-31 0:45 ` David Howells [this message]
2019-09-05 22:44 ` Dave Chinner
2019-08-20 13:31 ` David Howells
2019-08-08 8:27 ` [PATCH 3/9] ecryptfs: drop direct calls to ->bmap Carlos Maiolino
2019-08-08 22:50 ` kbuild test robot
2019-08-08 8:27 ` [PATCH 4/9] fibmap: Use bmap instead of ->bmap method in ioctl_fibmap Carlos Maiolino
2019-08-08 20:38 ` kbuild test robot
2019-08-14 11:01 ` Carlos Maiolino
2019-08-14 11:08 ` Christoph Hellwig
2019-08-08 8:27 ` [PATCH 5/9] fs: Move start and length fiemap fields into fiemap_extent_info Carlos Maiolino
2019-08-08 20:21 ` kbuild test robot
2019-08-08 8:27 ` [PATCH 6/9] iomap: Remove length and start fields from iomap_fiemap Carlos Maiolino
2019-08-08 8:27 ` [PATCH 7/9] fiemap: Use a callback to fill fiemap extents Carlos Maiolino
2019-08-09 0:04 ` kbuild test robot
2019-08-14 11:16 ` Christoph Hellwig
2019-08-08 8:27 ` [PATCH 8/9] Use FIEMAP for FIBMAP calls Carlos Maiolino
2019-08-08 8:27 ` Carlos Maiolino
2019-08-09 1:56 ` kbuild test robot
2019-08-14 11:18 ` Christoph Hellwig
2019-08-20 13:01 ` Carlos Maiolino
2019-08-29 7:15 ` Christoph Hellwig
2019-09-10 12:28 ` Carlos Maiolino
2019-09-16 15:58 ` Darrick J. Wong
2019-08-08 8:27 ` [PATCH 9/9] xfs: Get rid of ->bmap Carlos Maiolino
-- strict thread matches above, loose matches on Subject: below --
2019-09-11 13:43 [PATCH 0/9 V6] New ->fiemap infrastructure and ->bmap removal Carlos Maiolino
2019-09-11 13:43 ` [PATCH 2/9] cachefiles: drop direct usage of ->bmap method Carlos Maiolino
2019-07-31 14:12 [PATCH 0/9 V4] New ->fiemap infrastructure and ->bmap removal Carlos Maiolino
2019-07-31 14:12 ` [PATCH 2/9] cachefiles: drop direct usage of ->bmap method Carlos Maiolino
2019-02-18 13:03 [PATCH 0/9 V3] New ->fiemap infrastructure and ->bmap removal Carlos Maiolino
2019-02-18 13:03 ` [PATCH 2/9] cachefiles: drop direct usage of ->bmap method Carlos Maiolino
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