Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.

2007-06-02 Thread Tejun Heo
Hello, Jens Axboe wrote: Would that be very different from issuing barrier and not waiting for its completion? For ATA and SCSI, we'll have to flush write back cache anyway, so I don't see how we can get performance advantage by implementing separate WRITE_ORDERED. I think zero-length

Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.

2007-06-02 Thread Jens Axboe
On Sat, Jun 02 2007, Tejun Heo wrote: Hello, Jens Axboe wrote: Would that be very different from issuing barrier and not waiting for its completion? For ATA and SCSI, we'll have to flush write back cache anyway, so I don't see how we can get performance advantage by implementing

Re: [RFC] obsoleting /etc/mtab

2007-06-02 Thread Jan Engelhardt
On Jun 1 2007 09:35, Karel Zak wrote: NFS takes a binary option block anyway. However, that's the exception, not the rule. I'm not sure, but I think that cifs and ncpfs (NetWare) are exceptions too. And the dying smbfs... Jan -- - To unsubscribe from this list: send the line

Re: [NFS] [PATCH] locks: provide a file lease method enabling cluster-coherent leases

2007-06-02 Thread Marc Eshel
[EMAIL PROTECTED] wrote on 06/02/2007 10:39:10 AM: On Fri, 2007-06-01 at 12:53 -0400, J. Bruce Fields wrote: It also means that you're calling twice down into the filesystem for every call to may_open() (once for vfs_permission() and once for break_lease()) and 3 times in

Re: [NFS] [PATCH] locks: provide a file lease method enabling cluster-coherent leases

2007-06-02 Thread Trond Myklebust
On Sat, 2007-06-02 at 11:09 -0700, Marc Eshel wrote: A cluster filesystem don't need the inode operation breake_lease. The fs must be able to detect the conflict and break the lease using __break_lease() call on all the nodes that hold a conflicting leases. Marc. Currently, the lease

Re: [NFS] [PATCH] locks: provide a file lease method enabling cluster-coherent leases

2007-06-02 Thread Trond Myklebust
On Sat, 2007-06-02 at 11:09 -0700, Marc Eshel wrote: [EMAIL PROTECTED] wrote on 06/02/2007 10:39:10 AM: ^ BTW: your mailer is seriously broken. Trond - To unsubscribe from this list: send the line unsubscribe linux-fsdevel in the body of a message to [EMAIL

Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.

2007-06-02 Thread Bill Davidsen
Jens Axboe wrote: On Fri, Jun 01 2007, Bill Davidsen wrote: Jens Axboe wrote: On Thu, May 31 2007, Bill Davidsen wrote: Jens Axboe wrote: On Thu, May 31 2007, David Chinner wrote: On Thu, May 31, 2007 at 08:26:45AM +0200, Jens Axboe wrote:

RE: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.

2007-06-02 Thread Guy Watkins
} -Original Message- } From: [EMAIL PROTECTED] [mailto:linux-raid- } [EMAIL PROTECTED] On Behalf Of Jens Axboe } Sent: Saturday, June 02, 2007 10:35 AM } To: Tejun Heo } Cc: David Chinner; [EMAIL PROTECTED]; Phillip Susi; Neil Brown; linux- } [EMAIL PROTECTED]; [EMAIL PROTECTED]; dm- }