GNU bug report logs -
#27666
[grep on GPFS filesystem] SEEK_HOLE problem
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Reported by: Moyard John <John.Moyard <at> cnes.fr>
Date: Wed, 12 Jul 2017 11:58:02 UTC
Severity: normal
Done: Paul Eggert <eggert <at> cs.ucla.edu>
Bug is archived. No further changes may be made.
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Message #14 received at 27666 <at> debbugs.gnu.org (full text, mbox):
Hi,
I forgot to precise that activate '--binary-files=text' grep option or integrate a synchronization step before a grep are not lasting solutions in all my shell scripts.
That's why I was asking about another way to identify a binary file instead using 'seek(SEEK_HOLE)' : do you think that it could possible?
Best regards
john
-----Message d'origine-----
De : Eric Blake [mailto:eblake <at> redhat.com]
Envoyé : mercredi 12 juillet 2017 16:11
À : Moyard John; 27666 <at> debbugs.gnu.org
Objet : Re: bug#27666: [grep on GPFS filesystem] SEEK_HOLE problem
On 07/12/2017 04:27 AM, Moyard John wrote:
> Hi,
>
> I use GPFS file system and I have sometimes an issue using grep command.
> When issue occurs with the following message "Binary file <myfile> matches"
> But "<myfile>" is an ASCII one, not a binary file.
> The problem seems to deals with lseek(SEEK_HOLE) command and a file not completely flushed after close.
If lseek(SEEK_HOLE) returns a mid-file offset when the file is first created, but not later after the file has been synced, then that is a bug in the filesystem which should be reported to the appropriate filesystem/kernel folks. SEEK_HOLE is only allowed to return a mid-file offset if reading the file at that point in time would read NUL bytes, and NUL bytes are indeed binary data.
> It could take several seconds to save the entire file on the disk.
Does running 'sync' prior to grep solve the problem?
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
This bug report was last modified 5 years and 194 days ago.
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