* Re: SPAM: Re: XFS corruption during power-blackout
[not found] ` <254889.27725ab660aa106eb6acc07307d71ef1fbd5b6fd366aebef9e2f611750fbcb467e46e8a4.IBX@taniwha.stupidest.org.suse.lists.linux.kernel>
@ 2005-06-29 23:11 ` Andi Kleen
2005-06-30 4:34 ` Chris Wedgwood
0 siblings, 1 reply; 2+ messages in thread
From: Andi Kleen @ 2005-06-29 23:11 UTC (permalink / raw)
To: Chris Wedgwood
Cc: Al Boldi, 'Nathan Scott',
linux-xfs, linux-kernel, linux-fsdevel, reiserfs-list
Chris Wedgwood <cw@f00f.org> writes:
> If caching is enabled I still lose data. Linux does have a concept of
> write barriers but these are presently not implemented for XFS right
> now.
I implemented them some time ago for log writes in XFS. Not for fsync though,
although fsync usually does a log write afterwards so it should work
in practice too. fdatasync might not.
Don't know if the code hasn't bit rotted away and it also was a bit
dumb. It was definitely there at some point.
But then a lot of ATA disks and SCSI don't support barriers. Or at least
the IDE barrier tests fails on several of my machines.
-Andi
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: SPAM: Re: XFS corruption during power-blackout
2005-06-29 23:11 ` SPAM: Re: XFS corruption during power-blackout Andi Kleen
@ 2005-06-30 4:34 ` Chris Wedgwood
0 siblings, 0 replies; 2+ messages in thread
From: Chris Wedgwood @ 2005-06-30 4:34 UTC (permalink / raw)
To: Andi Kleen
Cc: Al Boldi, 'Nathan Scott',
linux-xfs, linux-kernel, linux-fsdevel, reiserfs-list
On Thu, Jun 30, 2005 at 01:11:03AM +0200, Andi Kleen wrote:
> Don't know if the code hasn't bit rotted away and it also was a bit
> dumb. It was definitely there at some point.
It did rot away sadly but someone (speak up!) was working on a newer
version of this I just don't know how much time they've had to work on
this recently.
> But then a lot of ATA disks and SCSI don't support barriers. Or at
> least the IDE barrier tests fails on several of my machines.
IDE has no barriers. I thought the kernel was aware of this and
flushed when in those cases? Does that not work?
^ permalink raw reply [flat|nested] 2+ messages in thread
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2005-06-29 23:11 ` SPAM: Re: XFS corruption during power-blackout Andi Kleen
2005-06-30 4:34 ` Chris Wedgwood
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