From: Max Reitz <mreitz@redhat.com>
To: Markus Armbruster <armbru@redhat.com>, qemu-devel@nongnu.org
Cc: kwolf@redhat.com, famz@redhat.com, tony@bakeyournoodle.com,
stefanha@redhat.com, pbonzini@redhat.com
Subject: Re: [Qemu-devel] [PATCH v2 3/4] raw-posix: Fix try_seek_hole()'s handling of SEEK_DATA failure
Date: Thu, 13 Nov 2014 11:22:26 +0100 [thread overview]
Message-ID: <54648662.4030709@redhat.com> (raw)
In-Reply-To: <1415873823-13844-4-git-send-email-armbru@redhat.com>
On 2014-11-13 at 11:17, Markus Armbruster wrote:
> When SEEK_HOLE tells us we're in a hole, we try SEEK_DATA to find its
> end. When that fails, we pretend the hole extends to the end of file.
> Wrong. Except when SEEK_END fails, we screw up and claim it extends
> to offset -1. More wrong.
>
> Fortunately, these seeks are very unlikely to fail. Fix it anyway, by
> returning failure. The caller will then pretend there are no holes.
> Inaccurate, but safe.
>
> Signed-off-by: Markus Armbruster <armbru@redhat.com>
> ---
> block/raw-posix.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
Reviewed-by: Max Reitz <mreitz@redhat.com>
next prev parent reply other threads:[~2014-11-13 10:22 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-13 10:16 [Qemu-devel] [PATCH v2 0/4] raw-posix: Get rid of FIEMAP, and more Markus Armbruster
2014-11-13 10:17 ` [Qemu-devel] [PATCH v2 1/4] raw-posix: Fix comment for raw_co_get_block_status() Markus Armbruster
2014-11-13 10:17 ` [Qemu-devel] [PATCH v2 2/4] raw-posix: SEEK_HOLE suffices, get rid of FIEMAP Markus Armbruster
2014-11-13 10:19 ` Max Reitz
2014-11-13 14:09 ` Eric Blake
2014-11-13 10:17 ` [Qemu-devel] [PATCH v2 3/4] raw-posix: Fix try_seek_hole()'s handling of SEEK_DATA failure Markus Armbruster
2014-11-13 10:22 ` Max Reitz [this message]
2014-11-13 13:03 ` Kevin Wolf
2014-11-13 14:52 ` Eric Blake
2014-11-13 15:29 ` Eric Blake
2014-11-13 15:44 ` Max Reitz
2014-11-13 15:49 ` Eric Blake
2014-11-13 15:52 ` Eric Blake
2014-11-13 15:47 ` Eric Blake
2014-11-13 16:01 ` Eric Blake
2014-11-14 13:12 ` Markus Armbruster
2014-11-15 0:47 ` Eric Blake
2014-11-13 10:17 ` [Qemu-devel] [PATCH v2 4/4] raw-posix: Clean up around raw_co_get_block_status() Markus Armbruster
2014-11-13 10:27 ` Max Reitz
2014-11-13 12:48 ` Markus Armbruster
2014-11-13 13:30 ` [Qemu-devel] [PATCH v2 0/4] raw-posix: Get rid of FIEMAP, and more Eric Blake
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