From: "Richard W.M. Jones" <rjones@redhat.com>
To: Fam Zheng <famz@redhat.com>
Cc: qemu-devel@nongnu.org, Kevin Wolf <kwolf@redhat.com>,
qemu-block@nongnu.org, Jeff Cody <jcody@redhat.com>,
Markus Armbruster <armbru@redhat.com>,
Max Reitz <mreitz@redhat.com>,
den@openvz.org, pbonzini@redhat.com, John Snow <jsnow@redhat.com>
Subject: Re: [Qemu-devel] [PATCH for-2.7 00/15] block: Lock images when opening
Date: Sun, 17 Apr 2016 20:15:52 +0100 [thread overview]
Message-ID: <20160417191552.GI19398@redhat.com> (raw)
In-Reply-To: <1460538604-12132-1-git-send-email-famz@redhat.com>
On Wed, Apr 13, 2016 at 05:09:49PM +0800, Fam Zheng wrote:
> Underneath is the fcntl syscall that locks the local file, similar to what is
> already used in libvirt virtlockd. Also because of that, we cannot directly
> apply fcntl lock on the image file itself, instead we open and lock
> "/var/tmp/.qemu-$sha1.lock", where $sha1 is derived
Any particular reason why not /tmp instead of /var/tmp? I assume
these are zero-sized or otherwise small files.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
Fedora Windows cross-compiler. Compile Windows programs, test, and
build Windows installers. Over 100 libraries supported.
http://fedoraproject.org/wiki/MinGW
prev parent reply other threads:[~2016-04-17 19:16 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-13 9:09 [Qemu-devel] [PATCH for-2.7 00/15] block: Lock images when opening Fam Zheng
2016-04-13 9:09 ` [Qemu-devel] [PATCH for-2.7 01/15] block: Add BDRV_O_NO_LOCK Fam Zheng
2016-04-13 9:09 ` [Qemu-devel] [PATCH for-2.7 02/15] qapi: Add lock-image in blockdev-add options Fam Zheng
2016-04-13 9:09 ` [Qemu-devel] [PATCH for-2.7 03/15] blockdev: Add and parse "lock-image" option for block devices Fam Zheng
2016-04-13 9:09 ` [Qemu-devel] [PATCH for-2.7 04/15] block: Introduce image file locking interface Fam Zheng
2016-04-13 9:09 ` [Qemu-devel] [PATCH for-2.7 05/15] raw-posix: Implement .bdrv_lockf Fam Zheng
2016-04-13 9:21 ` Daniel P. Berrange
2016-04-14 2:24 ` Fam Zheng
2016-04-13 9:09 ` [Qemu-devel] [PATCH for-2.7 06/15] gluster: " Fam Zheng
2016-04-13 9:09 ` [Qemu-devel] [PATCH for-2.7 07/15] qemu-io: Add "-L" option for BDRV_O_NO_LOCK Fam Zheng
2016-04-14 7:06 ` Denis V. Lunev
2016-04-14 8:15 ` Fam Zheng
2016-04-13 9:09 ` [Qemu-devel] [PATCH for-2.7 08/15] qemu-iotests: 140: Disable image lock for qemu-io access Fam Zheng
2016-04-13 9:09 ` [Qemu-devel] [PATCH for-2.7 09/15] qemu-iotests: 046: Move version detection out from verify_io Fam Zheng
2016-04-13 9:09 ` [Qemu-devel] [PATCH for-2.7 10/15] qemu-iotests: Fix lock-image for shared disk in test case 091 Fam Zheng
2016-04-13 9:10 ` [Qemu-devel] [PATCH for-2.7 11/15] qemu-iotests: Disable image lock when checking test image Fam Zheng
2016-04-13 9:10 ` [Qemu-devel] [PATCH for-2.7 12/15] qemu-iotests: 051: Disable image lock in the command line Fam Zheng
2016-04-13 9:10 ` [Qemu-devel] [PATCH for-2.7 13/15] ahci-test: Specify "lock-image=off" in CLI Fam Zheng
2016-04-13 9:10 ` [Qemu-devel] [PATCH for-2.7 14/15] ide-test: Specify "lock-image=off" in command lines Fam Zheng
2016-04-13 9:10 ` [Qemu-devel] [PATCH for-2.7 15/15] block: Turn on image locking by default Fam Zheng
2016-04-13 9:19 ` [Qemu-devel] [PATCH for-2.7 00/15] block: Lock images when opening Daniel P. Berrange
2016-04-14 2:31 ` Fam Zheng
2016-04-13 10:18 ` Denis V. Lunev
2016-04-14 2:36 ` Fam Zheng
2016-04-14 5:04 ` Denis V. Lunev
2016-04-14 5:46 ` Fam Zheng
2016-04-14 6:14 ` Denis V. Lunev
2016-04-14 6:23 ` Fam Zheng
2016-04-14 6:41 ` Denis V. Lunev
2016-04-17 19:15 ` Richard W.M. Jones [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20160417191552.GI19398@redhat.com \
--to=rjones@redhat.com \
--cc=armbru@redhat.com \
--cc=den@openvz.org \
--cc=famz@redhat.com \
--cc=jcody@redhat.com \
--cc=jsnow@redhat.com \
--cc=kwolf@redhat.com \
--cc=mreitz@redhat.com \
--cc=pbonzini@redhat.com \
--cc=qemu-block@nongnu.org \
--cc=qemu-devel@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.