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bug#27666: [grep on GPFS filesystem] SEEK_HOLE problem
From: |
Eric Blake |
Subject: |
bug#27666: [grep on GPFS filesystem] SEEK_HOLE problem |
Date: |
Tue, 18 Jul 2017 06:30:37 -0500 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 |
On 07/18/2017 06:23 AM, Moyard John wrote:
> GPFS maintainers give me the answer including manpage close(2) : nothing will
> be done.
> On the web, same problems has been identified for ZFS or perhaps NFS v4 ? :
> https://utcc.utoronto.ca/~cks/space/blog/linux/GrepBinaryFileReason
> https://github.com/zfsonlinux/zfs/issues/6050
> https://lists.gnu.org/archive/html/bug-grep/2012-07/msg00022.html
> I will not file a bug on each file system maintainers : I should obtain the
> same answer.
> Or perhaps I will obtain an extract of manpage lseek(2), i.e.
> http://man7.org/linux/man-pages/man2/lseek.2.html :
> However, a filesystem is not obliged to report holes, so
> these operations are not a guaranteed mechanism for mapping the
> storage space actually allocated to a file
> It's not a bug in file system.
A file system is not obliged to report holes, but IS obliged to NOT
report holes if a read() on that range will not see zeroes. I still
think GPFS has a bug.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
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- bug#27666: [grep on GPFS filesystem] SEEK_HOLE problem, Moyard John, 2017/07/12
- bug#27666: [grep on GPFS filesystem] SEEK_HOLE problem, Eric Blake, 2017/07/12
- bug#27666: [grep on GPFS filesystem] SEEK_HOLE problem, Moyard John, 2017/07/12
- bug#27666: [grep on GPFS filesystem] SEEK_HOLE problem, Moyard John, 2017/07/13
- bug#27666: [grep on GPFS filesystem] SEEK_HOLE problem, Paul Eggert, 2017/07/13
- bug#27666: [grep on GPFS filesystem] SEEK_HOLE problem, Moyard John, 2017/07/18
- bug#27666: [grep on GPFS filesystem] SEEK_HOLE problem,
Eric Blake <=
- bug#27666: [grep on GPFS filesystem] SEEK_HOLE problem, Paul Eggert, 2017/07/19
- bug#27666: [grep on GPFS filesystem] SEEK_HOLE problem, Moyard John, 2017/07/20
- bug#27666: [grep on GPFS filesystem] SEEK_HOLE problem, Eric Blake, 2017/07/20