Re: [Cluster-devel] [Lsf-pc] [LSF/MM ATTEND] [TOPIC] fs/block interface discussions

2014-12-12 Thread Steven Whitehouse
Hi, On 11/12/14 00:52, Alasdair G Kergon wrote: On Wed, Dec 10, 2014 at 07:46:51PM +0100, Jan Kara wrote: But still you first need to stop all writes to the filesystem, then do a sync, and then allow writing again - which is exactly what freeze does. And with device-mapper, we were asked

Re: [Cluster-devel] [Lsf-pc] [LSF/MM ATTEND] [TOPIC] fs/block interface discussions

2014-12-12 Thread Jan Kara
Hi, On Fri 12-12-14 11:46:34, Steven Whitehouse wrote: On 11/12/14 00:52, Alasdair G Kergon wrote: On Wed, Dec 10, 2014 at 07:46:51PM +0100, Jan Kara wrote: But still you first need to stop all writes to the filesystem, then do a sync, and then allow writing again - which is exactly what

Re: [Cluster-devel] [Lsf-pc] [LSF/MM ATTEND] [TOPIC] fs/block interface discussions

2014-12-12 Thread Alex Elsayed
Alex Elsayed wrote: Jan Kara wrote: Hi, On Fri 12-12-14 11:46:34, Steven Whitehouse wrote: On 11/12/14 00:52, Alasdair G Kergon wrote: On Wed, Dec 10, 2014 at 07:46:51PM +0100, Jan Kara wrote: But still you first need to stop all writes to the filesystem, then do a sync, and

Re: [Cluster-devel] [Lsf-pc] [LSF/MM ATTEND] [TOPIC] fs/block interface discussions

2014-12-12 Thread Alex Elsayed
Jan Kara wrote: Hi, On Fri 12-12-14 11:46:34, Steven Whitehouse wrote: On 11/12/14 00:52, Alasdair G Kergon wrote: On Wed, Dec 10, 2014 at 07:46:51PM +0100, Jan Kara wrote: But still you first need to stop all writes to the filesystem, then do a sync, and then allow writing again

Re: [Cluster-devel] [Lsf-pc] [LSF/MM ATTEND] [TOPIC] fs/block interface discussions

2014-12-10 Thread Jan Kara
Hi, On Wed 10-12-14 11:49:48, Steven Whitehouse wrote: I'm interested generally in topics related to integration between components, one example being snapshots. We have snapshots at various different layers (can be done at array level or dm/lvm level and also we have filesystem support in

Re: [Cluster-devel] [Lsf-pc] [LSF/MM ATTEND] [TOPIC] fs/block interface discussions

2014-12-10 Thread Steven Whitehouse
Hi, On 10/12/14 12:48, Jan Kara wrote: Hi, On Wed 10-12-14 11:49:48, Steven Whitehouse wrote: I'm interested generally in topics related to integration between components, one example being snapshots. We have snapshots at various different layers (can be done at array level or dm/lvm level

Re: [Cluster-devel] [Lsf-pc] [LSF/MM ATTEND] [TOPIC] fs/block interface discussions

2014-12-10 Thread Jan Kara
Hi, On Wed 10-12-14 14:13:02, Steven Whitehouse wrote: On 10/12/14 12:48, Jan Kara wrote: On Wed 10-12-14 11:49:48, Steven Whitehouse wrote: I'm interested generally in topics related to integration between components, one example being snapshots. We have snapshots at various different

Re: [Cluster-devel] [Lsf-pc] [LSF/MM ATTEND] [TOPIC] fs/block interface discussions

2014-12-10 Thread Alasdair G Kergon
On Wed, Dec 10, 2014 at 07:46:51PM +0100, Jan Kara wrote: But still you first need to stop all writes to the filesystem, then do a sync, and then allow writing again - which is exactly what freeze does. And with device-mapper, we were asked to support the taking of snapshots of multiple