From: "Richard W.M. Jones" <rjones@redhat.com>
To: Fam Zheng <famz@redhat.com>
Cc: qemu-devel@nongnu.org, Kevin Wolf <kwolf@redhat.com>,
Max Reitz <mreitz@redhat.com>, Jeff Cody <jcody@redhat.com>,
Markus Armbruster <armbru@redhat.com>,
Eric Blake <eblake@redhat.com>,
qemu-block@nongnu.org, stefanha@redhat.com, pbonzini@redhat.com,
John Snow <jsnow@redhat.com>,
berrange@redhat.com, den@openvz.org
Subject: Re: [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening
Date: Tue, 10 May 2016 09:14:26 +0100 [thread overview]
Message-ID: <20160510081425.GV1683@redhat.com> (raw)
In-Reply-To: <1462848659-28659-1-git-send-email-famz@redhat.com>
On Tue, May 10, 2016 at 10:50:32AM +0800, Fam Zheng wrote:
> v4: Don't lock RO image. [Rich]
I applied this on top of HEAD and added some debugging messages to
block/raw-posix.c so I can see when files are being opened and locked,
and it does appear to do the right thing for read-only and
write-exclusive files, ie. it applies an exclusive lock when opening a
file for write-exclusive, and no lock when opening a file for read.
However I didn't test the write-shareable case (the libvirt
<shareable/> flag which should map to a shared lock -- is that right Dan?).
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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next prev parent reply other threads:[~2016-05-10 8:14 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-10 2:50 [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 01/27] block: Add BDRV_O_NO_LOCK Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 02/27] qapi: Add lock-image in blockdev-add options Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 03/27] blockdev: Add and parse "lock-image" option for block devices Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 04/27] block: Introduce image file locking Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 05/27] block: Add bdrv_image_locked Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 06/27] block: Make bdrv_reopen_{commit, abort} private functions Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 07/27] block: Handle image locking during reopen Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 08/27] osdep: Add qemu_lock_fd and qemu_unlock_fd Fam Zheng
2016-05-10 7:54 ` Richard W.M. Jones
2016-05-10 8:57 ` Daniel P. Berrange
2016-05-10 9:06 ` Richard W.M. Jones
2016-05-10 9:20 ` Daniel P. Berrange
2016-05-11 0:48 ` Fam Zheng
2016-05-11 1:05 ` Fam Zheng
2016-05-11 9:01 ` Daniel P. Berrange
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 09/27] osdep: Introduce qemu_dup Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 10/27] raw-posix: Use qemu_dup Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 11/27] raw-posix: Implement .bdrv_lockf Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 12/27] gluster: " Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 13/27] qemu-io: Add "-L" option for BDRV_O_NO_LOCK Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 14/27] qemu-img: Add "-L" option to sub commands Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 15/27] qemu-img: Update documentation of "-L" option Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 16/27] qemu-nbd: Add "--no-lock/-L" option Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 17/27] block: Don't lock drive-backup target image in none mode Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 18/27] mirror: Disable image locking on target backing chain Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 19/27] qemu-iotests: 140: Disable image lock for qemu-io access Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 20/27] qemu-iotests: 046: Move version detection out from verify_io Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 21/27] qemu-iotests: Wait for QEMU processes before checking image in 091 Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 22/27] qemu-iotests: 030: Disable image lock when checking test image Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 23/27] iotests: 087: Disable image lock in cases where file is shared Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 24/27] iotests: Disable image locking in 085 Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 25/27] tests: Use null-co:// instead of /dev/null Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 26/27] block: Turn on image locking by default Fam Zheng
2016-05-10 2:50 ` [Qemu-devel] [PATCH v4 27/27] qemu-iotests: Add test case 153 for image locking Fam Zheng
2016-05-10 8:14 ` Richard W.M. Jones [this message]
2016-05-10 8:43 ` [Qemu-devel] [PATCH v4 00/27] block: Lock images when opening Richard W.M. Jones
2016-05-10 8:50 ` Daniel P. Berrange
2016-05-10 9:14 ` Kevin Wolf
2016-05-10 9:23 ` Daniel P. Berrange
2016-05-10 9:35 ` Kevin Wolf
2016-05-10 9:43 ` Daniel P. Berrange
2016-05-10 10:07 ` Kevin Wolf
2016-05-10 10:16 ` Richard W.M. Jones
2016-05-10 11:08 ` Kevin Wolf
2016-05-10 11:46 ` Richard W.M. Jones
2016-05-10 12:01 ` Kevin Wolf
2016-05-10 12:11 ` Richard W.M. Jones
2016-05-10 12:22 ` Daniel P. Berrange
2016-05-10 12:45 ` Kevin Wolf
2016-05-11 8:04 ` Markus Armbruster
2016-05-11 8:52 ` Daniel P. Berrange
2016-05-11 8:04 ` Fam Zheng
2016-05-11 9:28 ` Richard W.M. Jones
2016-05-11 10:03 ` Kevin Wolf
2016-05-10 10:29 ` Daniel P. Berrange
2016-05-10 11:14 ` Kevin Wolf
2016-05-10 10:02 ` Richard W.M. Jones
2016-05-11 11:48 ` Richard W.M. Jones
2016-05-11 11:56 ` Kevin Wolf
2016-05-12 1:07 ` Fam Zheng
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